Impact of early blood pressure variability on stroke outcomes after thrombolysis: the SAMURAI rt-PA Registry.

BACKGROUND AND PURPOSE

The present study determines associations between early blood pressure (BP) variability and stroke outcomes after intravenous thrombolysis.

METHODS

In 527 stroke patients receiving intravenous alteplase (0.6 mg/kg), BP was measured 8 times within the first 25 hours. BP variability was determined as ΔBP (maximum-minimum), standard deviation (SD), coefficient of variation, and successive variation.

RESULTS

The systolic BP course was lower among patients with modified Rankin Scale (mRS) 0 to 1 than those without (P<0.001). Most of systolic BP variability profiles were significantly associated with outcomes. Adjusted odds ratios (95% confidence interval) per 10 mm Hg (or 10% for coefficient of variation) on symptomatic intracerebral hemorrhage were as follows: ΔBP, 1.33 (1.08-1.66); SD, 2.52 (1.26-5.12); coefficient of variation, 3.15 (1.12-8.84); and successive variation, 1.82 (1.04-3.10). The respective values were 0.88 (0.77-0.99), 0.73 (0.48-1.09), 0.77 (0.43-1.34), and 0.76 (0.56-1.03) for 3-month mRS 0 to 1; and 1.40 (1.14-1.75), 2.85 (1.47-5.65), 4.67 (1.78-12.6), and 1.99 (1.20-3.25) for death. Initial BP values before thrombolysis were not associated with any outcomes.

CONCLUSIONS

Early systolic BP variability was positively associated with symptomatic intracerebral hemorrhage and death after intravenous thrombolysis.